Multi-channel electroluminescence of CdTe/CdS core-shell quantum dots implemented into a QLED device
Authors/Creators
- 1. Lviv Polytechnic National University
- 2. Lodz University of Technology
- 3. Yuriy Fedkovych Chernivtsi National University
- 4. Bohdan Khmelnytsky National University
- 5. KTH Royal Institute of Technology
Description
CdTe/CdS core-shell quantum dots were synthesized and implemented into a light emitting device resulting in multi-channel electroluminescence with a light-green emission colour. The main electroluminescence band at about 530 nm corresponds to the emission by the CdTe core (type I core/shell structure), while the next emission band at 595 nm is assigned to the crossed recombination of electrons from the conduction band of the CdS shell and holes from the valence band of the CdTe core (type II core/shell structure). At the same time, the photoluminescence spectrum of the synthesized CdTe/CdS core-shell quantum dots contains only one emission band distinctive for type II structures. This behavior of CdTe/CdS core-shell quantum dots upon the electroexcitation allows the extension of the electroluminescence spectrum in the optical region in a way that is useful for the lighting-source applications. Such multi-channel electroluminescence can most probably also be reproduced in related core-shell systems accounting for size-confinement between the core size and shell thickness.
Files
Dyes and Pigments,162, 643 – 653.pdf
Files
(920.0 kB)
| Name | Size | Download all |
|---|---|---|
|
md5:6ba797e9ab4c3abd086b85933e651933
|
920.0 kB | Preview Download |